88 lines
2.1 KiB
C++
88 lines
2.1 KiB
C++
/*
|
|
* \brief Implementation of the SIGNAL interface
|
|
* \author Norman Feske
|
|
* \date 2009-08-11
|
|
*/
|
|
|
|
/*
|
|
* Copyright (C) 2009-2011 Genode Labs GmbH
|
|
*
|
|
* This file is part of the Genode OS framework, which is distributed
|
|
* under the terms of the GNU General Public License version 2.
|
|
*/
|
|
|
|
/* Genode includes */
|
|
#include <base/ipc.h>
|
|
#include <base/printf.h>
|
|
|
|
/* core includes */
|
|
#include <signal_session_component.h>
|
|
|
|
using namespace Genode;
|
|
|
|
|
|
/*****************************
|
|
** Signal-source component **
|
|
*****************************/
|
|
|
|
void Signal_source_component::submit(Signal_context_component *context,
|
|
Ipc_ostream *ostream,
|
|
int cnt)
|
|
{
|
|
/*
|
|
* If the client does not block in 'wait_for_signal', the
|
|
* signal will be delivered as result of the next
|
|
* 'wait_for_signal' call.
|
|
*/
|
|
context->increment_signal_cnt(cnt);
|
|
|
|
/*
|
|
* If the client is blocking at the signal source (indicated by
|
|
* the valid reply capability), we wake him up.
|
|
*/
|
|
if (_reply_cap.valid()) {
|
|
|
|
*ostream << Signal(context->imprint(), context->cnt());
|
|
_entrypoint->explicit_reply(_reply_cap, 0);
|
|
|
|
/*
|
|
* We unblocked the client and, therefore, can invalidate
|
|
* the reply capability.
|
|
*/
|
|
_reply_cap = Untyped_capability();
|
|
context->reset_signal_cnt();
|
|
|
|
} else {
|
|
|
|
if (!context->is_enqueued())
|
|
_signal_queue.enqueue(context);
|
|
}
|
|
}
|
|
|
|
|
|
Signal_source::Signal Signal_source_component::wait_for_signal()
|
|
{
|
|
/* keep client blocked */
|
|
if (_signal_queue.empty()) {
|
|
|
|
/*
|
|
* Keep reply capability for outstanding request to be used
|
|
* for the later call of 'explicit_reply()'.
|
|
*/
|
|
_reply_cap = _entrypoint->reply_dst();
|
|
_entrypoint->omit_reply();
|
|
return Signal(0, 0); /* just a dummy */
|
|
}
|
|
|
|
/* dequeue and return pending signal */
|
|
Signal_context_component *context = _signal_queue.dequeue();
|
|
Signal result(context->imprint(), context->cnt());
|
|
context->reset_signal_cnt();
|
|
return result;
|
|
}
|
|
|
|
|
|
Signal_source_component::Signal_source_component(Rpc_entrypoint *ep)
|
|
: _entrypoint(ep) { }
|
|
|